Collapsible core.



T. MIDGLEY, SR. & T. MIDGLEY, 1R.

COLLAPSIBLE JCORE.

APPLICATION FILED JULY 16. 1914.

Patented Oct. 19, 1915.

' 2 SHEETSSHEET1 r. M y,

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suitable'molds within which are located an- UNITED STATES PATENT OFFICE.

THOMAS MIDGLEY, SR, AND THOMAS MIDGLEY, JR., OF WORTHINGTON, OHIO.

COLLAPSIBLE CORE.

Specification of Letters Patent.

Patented Oct. 19, 1915.

Application filed July 16, 1914. Serial No. 851,269.

T 0 all whom it may concern:

Be it known that we, THOMAS MrocLEY, Six, and THOMAS MIDGLEY, J r., citizens of the United States, residing at lVorthington, in the county of Franklin and State of Ohio, have invented certain newand useful Improvements Collapsible Cores, of which the'following is a specification.

Our invention 'relates to collapsible cores used in the manufacture of the outer casings formingthe major portion of pneu-- matic' tires, this core being particularly adapted for use in connection with casings having 'inextehsible edge portions. As is well k'nowmthes'e tire casings are formed in nula r cores for properly shaping and giving size to their interiors and where these CilS'. ings are provided with ineXtensi-ble edges, it is necessarytha-t the iron core be collapsible in suchform that it may be readily removable from within the tire casing. It is then possible to remove these iron cores be.- cause of the central annular-opening around the inner or rim face of the casing itself.

One object of our invention resides in the provision of novel means for attaching and holding assembled the various sections forming the collapsible core, these means having in mind a construction which willjfacilitate the rapid assembling and dis-assembling of the core commensurate with its economic production. In its' broadest sense, these means take the form of ring sections adapted to carry the core segments but formed separately therefrom, the sections being adapted to be detachably connected to 'each other.

Our invention also resides in the particular manner in which the core segments are carried by the ring sections. This portion of our invention resides in providing ring sections formed separately from the core segments, but rigidly held in place thereon by a connection formed'by casting the segments onto the sections.-

Another object of our'invention resides in.

so constructing the various ring members-in connection with the foregoing paragraph, that the metal forming the core segments will be positively attached thereto irrespective of whether it has been cast hot enough to bond itself to the rings or not.

Where these cores are built up of comple with suitable material to avoid chipping-or breaking of the thinner edges around such abutting faces. Realizing this, it is another object of our invention to economically provide these facing plates.

Still a further object of this invention resides in the specific manner herein shown of attaching these facings, the connections between the core segments and these facings' being formed by casting the core segments onto the facing plates.

Still another object of our invention resides in so forming the core facings before their application to the segment ends to prevent lateral play of these core segments when they are assembled and held in their assembled relation.

Our invention also resides in the novel construction, combination and arrangement of parts shown broadly in the accompanying drawings, in which similar characters of. reference designate corresponding parts,.

us, Figs. 8, 9 and 10 show a side elevation,

top plan and bottom views respectively of the ring section complemental to that shown in F ig. 5, Flg. 11 is a section taken on line 1111 of Fig. 8 and looking in the direction of the arrows, Fig. 12 is a view..of the ad-- joining ends of the two ring sections shown.

above, Fig. 13 is a section takengon line 13-13 of Fig. 12, Fig. 14 is a centralsection through the assembled facing plates, showing a portion of the two core sections, and, Fig. 15' is a cross sectionthrough the assembled facing plates shown separately and taken on line 15-15 of Fig. 14. x

As has been stated, all tire casings'having inextensibleedges are built around collapsi-' ble cores, the contour of the core itself being" that of the interior of the casing. In Fig. i

1, we have shown this collapsible 'core as being formed of sections 1, 2, 3 and 4. These,

coresegments are preferably cast hollow as.

is shown to materially reduce their weights,

but they are all preferably provided with outlet openings such as are shown at, 5,,these openings serving the double purpose of forming an outlet for the core sand after the segments have been cast and for permitting the escape of all generated gases within the core segments while they are being cast, as will be presently set forth.

In order to hold the various segments of which the assembled core is composed, .in assembled relation. we have built up a ring adapted to be centrally located with respect to the inner edge of the assembled core, this ring being composed of duplicates .of two sections 6 and 7. These two ring sections are so constructed that they may be as sembled to form a complete ring as is shown in Fig. 1 and to accomplish this, the section b is provided at both ends with spaced tongues 8 to form a bifurcation to receive a single centrally located tongue 9 carried by the members 7. Both the spaced tongues 8 and the centrally located tongue 9 are provided with apertures 10 and 11 respectively adapted to register when the sections are assembled and held in place by the passage of bolts or pins 12 therethrough. The major portion of the ring sections (3 and 7 are of a width such as is clearly shown in Fig. 2, while their top edge is provided with outstanding ilan fes whose head portions 13-are considerably larger than their throat or connecting portions 14. The flan e portion on the member 6 extends throughout the distance between the spaced ears 8, while the flange portion cari'ying the enlarged head 13 on the member 7 extends over the distance between the single tongues 9, but this memher is provided with an over-hanging lip 15, whose cross section may be clearly seen in Figs. 3 and 11. By this construction, a shoulder 16 is formed where the two flange portions meet. It will also be noted that the major body portions of both the members 6 and 7 are cut away adjacent their corresponding tongues 8 and 9 as is indicated at 17 and 18 respectively, to permit an inward movement of the core segn'icnts 1 and 2 to cause a collapsing of the core after the tire has been formed. Both the sections 6 and 7 are further provided with openings 19 to accommodate the short pipe sections as is shown at .40, these openings 19 being adapted to register with the openings 5 located in each of the core segments.

The ring is caused to unite with and hold the core segments .in their assembled relation in the following manner. The four ring sections 6 and 7, are assembled as is indicated in Fig. 1. from which it will be apparent that the overlapping tongues 15 on the sections 7 overlap the points of connection of the various sections. This assembled ring is then placed in a mold leaving the flange portions 18 and 15 extend into the imprint formed by the segment patterns. In other words, this assembled ring is so located in the mold that,"' ivhen the iron core is cast, the metal will be rmitted to flow and attach itself onto the r a sections. Should this metal not be hot enough when it is being poured to bond itself to the ring sections by fusion, the shape of the flange portions 1; and the enlargements where the openings 19 occur are such that when the metal cools, it will be positively attached without fusion. It will thus be apparent that the cast core is rigidly attached to the ring in a comparatively simple mannerw:

It has been common practice up to the present to cast the iron core solid and subsequently cut it up into the niunber of segments required. Inorder to avoid this, we preferably cast .the core segments separately, but in assembled relation with each other. This is accomplished by the provision of division members, as is clearly outlined in Fi 14 and 15. In these figures, we have S10Wl1 these members as being formed of four plates 21, 22. 23 and '24, the plates 21 and 22 being rigidly attached to each other as are also .the plates 23 and 24, thus making two sets of plates for each division member. The outside plates or those numbered 21 and 24 are provided with apertures 25 and 26 formed by iercing and bulging out the metal surrounc ing the pierced portions before the plates forming each set are rigidly attached to each other. All of these plates are also provided with a bulged portion as is shown at 27 to form a tongue and socket connection, the purpose of which will be afterward explained.

The manner in which the plates forming the division members are attached to the core segments themselves durin the casting operation is as follows: After tie assembled ring has been placed in the mold, the plates forming the division members are assembled in the manner shown in Fig. 14 and they are then also suitably located in the mold at points adjacent the points of jointure of the various ring sections. Then, when the core segments are cast, the free flowing metal will enter the spaces formed by the pierced portions 25 and 2b of the outside plates 21 and-24 and thus secure a perfect bonding between the various segments and the plates forming the division members. We preferably provide the portions 25 and 26 to uard against a possibility of the metal not eing sufficiently hot durmg the casting to cause a fusion of the plates thereto. It is to be understood that only the plates 21 and 22, and 23 and 2A are attached to each other and the two sets being independent of each other as far as permanent connections are concerned. Preterably, we coat the-coinciding surfaces of these sets with graphite or some similar ma- 'ili:

Lite

terial' to guard against a possible fusion of the two sets together during the castin operation. i

It will thus be apparent that the abutting 5 portions of the various core segments are all provided with facings which are positively attached thereto and which has been accomplished in a very simple manner. Further, by the tongue and socket c0nstrl1c-' tion caused by the bulged portions 27, all lateral movement of the various segments While they are in their assembled relation,- isovercome. By the use of the ring sections as has been previously outlined, a collapsible 16 core may be very readily constructed with a minimum amount of time and labor, although it is to be understood that either the division members or the ringsections may, if desired, be. used without using the other.

In actual use, the ring sections may be only temporarily secured together to be cast in connection with the segments and after this casting operation, the temporary pins may be removed, the holes rereamed and a hardened steel pin inserted. Also, the particular method used by us for obtaining a division of the various sections, is more clearly outlined in our co-pending application, Serial Number 851,270, filed July 16, 1914. f

What We claim, is:

l. A collapsible core comprising an annular body formed. of a plurality ofsegments, and a corresponding set of ring sec tions formed separately from said segments: but held in place thereon by a connection formed by casting said segments onto said sections. q

2. A collapsible core comprising an annular body formed of a plurality of segments,

a corresponding set of ring sections formed separately from said segments but held in place thereon by a connection formed by casting the segments onto said sections, and means for detachably securing said ring sections together.

3. A collapsible core comprising an annular body formed of a plurality of segments, ring sections corresponding in number and length with the number and length of segments, said sections being formed separate from said segments but heldin place thereinner portion thereof centrally onto said sections, andmeans for detachably securing said ring sections together. I

A collapsible core comprising an annular body formed of'a plurality of segments,

'ring sections corresponding in number and length with the number and length of segmentssaid sections being formed with out standing ribs Whose top edge portions are wider than the, portions connecting with "at said sections, a connection between each sag}v on by a connection formed by casting the I ments, tongue and slot connections between said sections, a second tongue carried by certain of said sections adapted to overlie said tongue and slot connections, and a connection between each section-and its respective segment formed by casting the segments onto said sections. 6. A collapsible core comprising an annular body formed of a plurality of segments, the abutting ends of said segments carrying tongue and groove formations to prevent lateral play When they are in assembled relation, a corresponding set of ring sections formed separately from said segments but held in place'thereon by connections formed by casting thesegments onto the sections, no and means for detachably connecting said ring sections together'to hold the segments: in assembled-relation.

7. A collapsible core comprising an annular body formed of a plurality of segments, a facing on each end of a said segments, attaching formations carried by one side of each facing, and connections between that portion of said facings carrying said formations and said segments formed by casting the segments on to the facings, said facings'being formed to prevent the flow of metal from one segment therethrough to the other. 8. A collapsible core comprising an an-. '10 nular body formed of a plurality of se ments, a facing on each end of said segments, each facing comprising aiplurality of, plates rigidly attached together, attaching? formations carried by one plate of each fac- .110 ing, and connections between the plate 'of, each facing having said formations'and said sections formed by casting the segments on to the facings, said facings being formed to prevent/the flow of metal from one segment therethrough to the other. I 9. A collapsible core comprising an annular body formed of a plurality of segments, facings for the abutting ends of said segments, each facing'comprising a plural 4:20 ity of plates rigidly attached together, one plate of each facing having a plurality'of apertures and the metal surrounding said apertures being pressed out, and connections between the. plate of each facing having said apertures and said sectionsformed by casting thesegments onto the facing to form rivet heads in said apertures. I

10. A vcollapsible core comprising an' an.- nular body 'fdrmed of a plurality of segand which ar so formed that at them is bodily removable inwardly, a 0013 ring sections.

, ments all of spondmg of each facing and 1 ts corresponding segt e acings.

IL A- collapsible core comprising an annular'body formed 01%, ments all of Whose cooperating ends coincide least one of connected $0 831 segments, and means for removably connecting said segments together holding said segments in assembled relation.

by removable connections through said ring sections.

12. A collapsible core nular body and which are so formed that at least one of them is bodily iemovable set of connectible ring sections connected to said segments, and detaching means engaging the ends of said ring sections for remow ably connecting the ends of said ring sections together.

13: A collapsible core comprising nular body formed of a plurality an anso formed that at least removable inwardly, a correspondmg set separately formed but rigidly connected to segments, tongue and groove formaabutting ends of said.

and which are so formed that times in presence of two one of tions on all of the abiitting ends of said sec: tions arranged to interlock with each other,

passage sections. 14;. A collapsible core comprising an annular body formed of a plurality of segments all of whose cooperating ends coincide removable inwardly, on each end of each of said segments, said facings being-so shaped to interlock with each other to prevent lateral play of the segments when assembled, and means for them is bodily 15. A collapsible core comprising an annular body formed -of a ments so formed that at least one of them is bodily removable inwardly, a facing on each abutting end of saidsegments, said facmg the segments onto said facings,

bled relation.

In testimony whereof we aflix witnesses.

THOMAS MIDGLEY, s11. THOMAS MIDGLEY, JR.

our signa- Witnesses WALTER E. L. L. PHELPS.

Boon,

Copies qthis patent may be obtained for five cents each,-by addressing the Commissioner 01' Patent- Washington, D. G. 

